span.field {
  font-size: 12px;
  font-family: "Times New Roman";
  display: inline-block;
  border-radius: 2px;
  height: 18px;
  text-align: center;
  line-height: 18px;
  padding: 0 4px;
}
span.field.charachter {
  color: #a96e34;
}
span.field.control {
  color: #78889c;
}
span.field.number-operator {
  color: #9d86a1;
  padding: 0;
  border: 1px solid #9d86a1;
  width: 18px;
}